Bulletin d’avalanche

Northwest Coastal

Apr 16 – 17, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Avalanche danger will increase when the sun is out. Watch for natural cornice falls and loose wet avalanches from steep terrain.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    The likelihood of cornices triggering increases with intense sunshine and/or during the warmest parts of the day.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Loose wet avalanches are likely at lower elevations where the snowpack may be isothermal. At higher elevations the loose wet problem is driven by exposure to sun and daytime warming.

Confidence

High -

Weather Forecast

Overnight: Moderate to strong Easterly winds with a couple of cm of new snow and freezing staying above 1000 metres. Monday: Mix of sun and cloud with moderate southeast winds and daytime freezing up to 1400 metres. Tuesday: Cooler with a good overnight freeze to 700 metres; 3-5 cm of new snow during the day with strong southwest winds developing and freezing up to 1000 metres. Wednesday: 5-8 cm of new snow with strong south winds and daytime freezing up to 1200 metres.

Avalanche Summary

There have been no recent reports of avalanche activity in the south of the region. That being said there is little to no information being passed on from the region recently. Exposure to large overhanging cornices remains a significant concern. As the sun comes out over the weekend expect to see cornices weaken and loose snow avalanches run from steep sun exposed slopes during the warmest parts of the day.

Snowpack Summary

New snow at upper elevations from last week has been redistributed by winds switching from southwest to east and back again. This may be sitting on a variety of old surfaces including hard wind crusts in exposed terrain and sun crusts on solar aspects. At the tree line elevation, warming and refreezing earlier in the week has created melt freeze crusts. Below tree line the surface snow is likely a mix of crusts at the upper end of the elevation band to moist or wet snow throughout the entire thickness of the snowpack at the lower portions of the elevation band.

Régions couvertes